/Engine/Source/Runtime/Projects/Public/Interfaces/IPluginManager.h
Adds a single plugin to the list of plugins. Faster than refreshing all plugins withRefreshPluginsList()when you only want to add one. Does nothing if already in the list.
True if the plugin was added or already in the list. False if it failed to load.
bool AddToPluginsList ( const [FString](API\Runtime\Core\Containers\FString) & PluginFilename, [FText](API\Runtime\Core\Internationalization\FText) * OutFailReason )